Interfacial adhesion and molecular diffusion in melt lamination of wood sawdust/ebonite NR and EPDM

Journal article

Authors/Editors

NARONGRIT SOMBATSOMPOP

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Publication Details

Author list: Yamsaemgsung W., Sombatsompop N.

Publisher: Wiley

Publication year: 2009

Journal: Polymer Composites (0272-8397)

Volume number: 30

Issue number: 3

Start page: 248

End page: 256

Number of pages: 9

ISSN: 0272-8397

eISSN: 1548-0569

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-62449228015&doi=10.1002%2fpc.20568&partnerID=40&md5=cc62ed527b8188e3d0df4e3830e3e440

Languages: English-Great Britain (EN-GB)

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Abstract

Adhesion mechanisms and peel strengths of wood/ebonite NR-EPDM laminates were investigated. Three different chemical coupling agents: namely; N-(฿ amino-ethyl)-y-aminopropyl-triethoxysilane (AAS), 3-methacry-loxypropyl trimethoxysilane (ACS), and Bis-(3-triethoxyl-propyl) tetrasulfan (Si69) were introduced into the wood/ NR composites to enhance an interaction between wood sawdust (SD) particles and NR molecyles, and to improve the adhesion strength between the SD/NR and EPDM layers. The quantitative evidences were giwen to explain the changes in the adhesion or peel strengths of the SD/NR-EPDM laminates through scanning electron microscopy with energy dispersive X-ray analysis (SEM-EDS). The experimental results indicated that the suitable eyre time and eyre temperature for SD/NR-EPDM melt-laminates were the tc90 of SD/NR composites and 14ฐC, respectiwely. The Si69 coypling agent was found to be the most effective coupling agent as compared with AAS and ACS coupling agents. The Si69 of 0.5 wt% was recommended for the optimizations of the tensile modulus of the SD/NR composites and the peel strength of the SD/NR-EPDM laminates. The diffusion level between the SD/NR and EPDM layers could be quantitatively substantiated by determining the sulfur content transfer from the SD/NR layer to the EPDM layer. The diffusion and entanglement of molecular chains from the SD/NR to the EPDM layer initiated the co-crosslink-ing reaction which played an important role on the changes in the interfacial strength in the SD/NR-EPDM melt-laminates.ฉ 2008 Society of Plastics Engineers.

Keywords